Properties of Regular Fuzzy Relations. - Jolanta Sobera (Int. J. Uncertain. Fuzziness Knowl. Based Syst., 2002)

Compositions of invariant fuzzy implications. - Józef Drewniak; Jolanta Sobera (Soft Comput., 2006)

Mixed pseudo-associativities of Bandler-Kohout compositions of relations. - Jolanta Sobera (Kybernetika, 2007)